Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0323n&link_type=abstract
American Astronomical Society, AAS Meeting #212, #3.23; Bulletin of the American Astronomical Society, Vol. 40, p.188
Astronomy and Astrophysics
Astronomy
Scientific paper
The photo-dissociation of most molecules is typically obtained with pre-computed exponentially-attenuated fitted photo rates, whose assumptions are likely to describe few astronomical environments. Furthermore, calculations of cross sections for the photo-dissociation of HD are currently available only for the ground rotational states. Explicit calculations of cross sections for all rovibrational states are necessary in order to compute HD photo-destruction rates for any environment and radiation field. To this end, we have directly calculated the partial cross sections for the B ← X and C ← X transitions of HD from all 400 rovibrational levels of the ground electronic state into the continua of the upper electronic states. This required input of a combination of ab initio and experimentally derived potential curves and dipole transition moments as well as separate calculation of the rovibrational energy levels of HD. The partial cross sections were calculated for a number of wavelengths ranging from 500 Angstroms to the dissociation threshold of each rovibrational state.
This work was funded by NSF grant AST-0607733.
Gay C. D.
Niculas Claudia
Stancil Phillip C.
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